/* wf_log.c -- float version of w_log.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
 * wrapper logf(x)
 */

#include "fdlibm.h"
#include <errno.h>

#ifdef __STDC__
    float logf(float x)     /* wrapper logf */
#else
    float logf(x)           /* wrapper logf */
    float x;
#endif
{
#ifdef _IEEE_LIBM
    return __ieee754_logf(x);
#else
    float z;
    struct exception exc;
    z = __ieee754_logf(x);
    if(_LIB_VERSION == _IEEE_ || isnan(x) || x > (float)0.0) return z;
#ifndef HUGE_VAL
#define HUGE_VAL inf
    double inf = 0.0;

    SET_HIGH_WORD(inf,0x7ff00000);  /* set inf to infinite */
#endif
    exc.name = "logf";
    exc.err = 0;
    exc.arg1 = exc.arg2 = (double)x;
    if (_LIB_VERSION == _SVID_)
           exc.retval = -HUGE;
    else
       exc.retval = -HUGE_VAL;
    if(x==(float)0.0) {
        /* logf(0) */
        exc.type = SING;
        if (_LIB_VERSION == _POSIX_)
           Djy_SaveLastError(ERANGE);
        else if (!matherr(&exc)) {
           Djy_SaveLastError(ERANGE);
        }
    } else {
        /* logf(x<0) */
        exc.type = DOMAIN;
        if (_LIB_VERSION == _POSIX_)
           Djy_SaveLastError(EDOM);
        else if (!matherr(&exc)) {
           Djy_SaveLastError(EDOM);
        }
            exc.retval = nan("");
        }
    if (exc.err != 0)
           Djy_SaveLastError(exc.err);
        return (float)exc.retval;
#endif
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
    double log(double x)
#else
    double log(x)
    double x;
#endif
{
    return (double) logf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */
